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Ramesh Balasubramanyam
Associate Professor
Office phone : +91 9480836132
Email : ramesh
Webpage : www.rri.res.in/~ramesh

   
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My current research interests are molecular clouds, star-formation and radio astronomy instrumentation. I have proposed new optics for radio telescopes that have benefits, especially for surveys at high frequencies. I am currently pursuing a demonstration of their working capability by building receivers at 12 to 30 GHz range and proof-of-concept telescopes based on these principles.
 
 
Selected Publications
 
1 An Efficient Linear-array Imager for radio astronomy,
Balasubramanyam, R.,
2014, MNRAS.444.2212B
   
2 One-element interferometer, 
Balasubramanyam, R.,
2014, MNRAS.444.2128B
   
3 12 GHz Radio-Holographic Surface Measurements of the RRI 10.4 m Telescope,
Balasubramanyam, R., Venkatesh, S., Raju, S.
2009, ASPC..407..434B
   
4 Physical and chemical conditions in methanol maser selected hot cores and UCHII regions,
Purcell, C. et al.,
2009, MNRAS.394..323P
   
5 HI content in galaxies in loose groups,
Sengupta, C.& Balasubramanyam, R.,
2006, MNRAS.369..360S
   
6 A CH3CN and HCO+ survey towards southern methanol masers associated with star formation,
Purcell, C. et al.,
2006, MNRAS.367..553P
   
7 A Molecular Line Survey of W3(OH) and W3 IRS 5 from 84.7 to 115.6 GHz: Observational Data and Analyses,
Kim, H. et al.,
2006, ApJS..162..161K
   
   
 
Vacancies in my group:
 

I currently have 4 positions open in my group. The projects and the requisite qualifications are described below. Interested students with relevant background may apply.

Molecular Astronomy Lab at the Raman Research Institute is currently engaged in building and validating a “Fan-beam” telescope, an element essential to construct the recently proposed cross telescope. (RB, 2014, MNRAS, 444, p2212). We have completed the 15m x 1m parabolic cylindrical frame structure and built a Coordinate Measurement Machine that can measure the surface down to +/-1 mm accuracy. Now, we are in the process of paneling the frame and setting the surface to the desired parabola. We have also built various receiver components such as filters, mixer, LO and gain blocks required to construct a Ku-band receiver. We are in the process of making the front-end.

Radio Astronomy is an inter-disciplinary endeavour and encompasses various engineering disciplines such as Mechanical, Electronics and Computer Science. The “Fan-Beam Telescope" project offers opportunities for young engineers to gain hands-on core-area experience in design, development and validation of essential components and enable them to blossom into complete engineers.
 
  Ku-band Receiver Development
   
 
    • Designing, fabricating and validating Spiral Broad-band Planar Antenna feeds
      Candidates who have completed or are about to complete their BE (ECE) or BTech (ECE) or ME or MTech, with a good academic record, genuine interest in microwaves and RF engineering, a good grasp of electromagnetics and antenna design and are comfortable using electronic CAD simulation software (e.g. HFSS) only need apply. Ability to use advanced measurement instruments such as Spectrum and Network analyzers would be an advantage. 
   
 
    • Multi-stage pHEMT-based LNA design, fabrication and validation
      Candidates who have completed or are about to complete their BE (ECE) or BTech (ECE) or ME or MTech, with a good academic record, genuine interest in microwaves and RF engineering, a good grasp of amplifier design and are comfortable using electronic CAD simulation software (e.g. ADS) only need apply.  Ability to use advanced measurement instruments such as Spectrum and Network analyzers would be an advantage. 
   
 
    • Receiver system integration, testing and validation 
      Candidates who have completed or are about to complete their BE (ECE) or BTech (ECE), or ME or MTech with a good academic record, genuine interest in microwaves and RF engineering, a good grasp of heterodyne receiver working and design and are comfortable using advanced measurement instruments such as Spectrum and Network analyzers only need apply. Documentation skills would be an advantage.
   
   
  Fan-beam Telescope Surface Validation and Base Structure Development
Candidates who have or are about to complete their BE (Mech) or BTech (Mech) or ME or MTech, with a good academic record, genuine interest in structural engineering, a good grasp of materials and truss-design and are comfortable using electronic CAD simulation software (e.g. AutoDesk Inventor, ProE etc.) only need apply.  Ability to fabricate, measure and validate mechanical elements would be an advantage.
   
   
   
   
   
   
 
 
 
 
 
   
 
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